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19
20 package org.apache.cayenne;
21
22 import java.io.Serializable JavaDoc;
23
24 /**
25  * Represents a placeholder for an unresolved relationship from a source object. Fault is
26  * resolved via {@link #resolveFault(Persistent, String)}. Depending on the type of fault
27  * it is resolved differently. Each type of fault is a singleton that can be obtained via
28  * corresponding static method.
29  *
30  * @since 1.1
31  * @author Andrus Adamchik
32  */
33 // TODO: serialization of faults should take into account the fact that
34 // they are used as singletons to avoid duplicate creation on deserialization
35 public abstract class Fault implements Serializable JavaDoc {
36
37     protected static Fault toOneFault;
38     protected static Fault toManyFault;
39
40     public static Fault getToOneFault() {
41         return toOneFault;
42     }
43
44     public static Fault getToManyFault() {
45         return toManyFault;
46     }
47
48     protected Fault() {
49     }
50
51     /**
52      * Returns an object for a given source object and relationship.
53      */
54     public abstract Object JavaDoc resolveFault(Persistent sourceObject, String JavaDoc relationshipName);
55 }
56
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